Mill Valley
California, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Mill Valley, CA

September, the first month of the autumn, in Mill Valley, is still a warm month, with average temperature ranging between min 53.1°F (11.7°C) and max 82°F (27.8°C).

Temperature

In September, the average high-temperature is practically the same as in August - a still warm 82°F (27.8°C). In Mill Valley, the average low-temperature is 53.1°F (11.7°C).

Daylight

In Mill Valley, the average length of the day in September is 12.4h.

What is the temperature in September in Mill Valley?

The average high-temperature, in September, in Mill Valley, is 82°F (27.8°C), while the average low-temperature is 53.1°F (11.7°C).

What is the average length of the day in September in Mill Valley?

In Mill Valley, California, the average length of the day in September is 12.4h.
Average temperature in September - Mill Valley, CA
  • Average high temperature in September: 82°F

The warmest month (with the highest average high temperature) is July (85°F).
Months with the lowest average high temperature are January and December (56°F).

  • Average low temperature in September: 53°F

The month with the highest average low temperature is August (54°F).
Coldest months (with the lowest average low temperature) are January and December (41°F).

Average daylight in September - Mill Valley, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.8h).
The month with shortest days is December (Average daylight: 9.6h).